True RMS Watt Meter


Posted on Sep 4, 2012

This circuit will give you a good, Accurate Watt Meter that can measure various power levels. In the Origional Article the Shunt was a .001 Ohm Copper Shunt giving a 1000 Watt Scale. However, because Most Circuit Breakers in homes are 15 Amps, I made my unit to have a range of Zero to 1500 Watts.


True RMS Watt Meter
Click here to download the full size of the above Circuit.

The Shunt on my unit is comprised of 5 small LOOPS in a Single piece of wire in an Inverted V Shape or an " _n_n_n_n_n_ " Shape, going from pad to pad. I used a #16 AWG wire, but you need to determine wire size and lengths based on the wattage r




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